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Controlled-Capacitor-Charging (CCC) is a technique to synthesize a desired voltage profile at the output from the unregulated DC at the input. Earlier models of the Controlled-Capacitor-Charging type Inverters deals with the Single-Phase Inverter and the dynamic performance are not available. This paper deals with the performance of Capacitor-Charging-type Inverter. A simple technique to design the...
The modular non-isolated inverter structure enhances the efficiency and redundancy of the PV generation system. Current coupling between the transformerless grid-connected inverter modules for PV power system is researched. The operation modes of the non-isolated inverters with different topologies and modulations are analyzed and the current decoupling conditions are obtained. Inverters which are...
Since control of a three-phase machine requires only two currents, it is possible to independently control a number of three-phase machines using reduced-switch-count voltage source inverter (VSI) topologies. One such configuration consists of n three-phase machines, supplied by a (2n+1)-leg inverter, where one inverter leg is common for all machines. This paper deals with a particular case of this...
Whether the intermediate inductor current can be kept balanced or not is vital to the output performance of multilevel current-source inverters (CSI's). This paper begins by introducing the operational principle of a three-phase 5-level CSI topology. In such a 5-level CSI system, control of the 1/2-level intermediate DC-link current is identified as a key problem. In order to keep the intermediate...
A small signal analysis of DC-DC converters with Average Current Mode Control (ACMC) in Continuous Conduction Mode (CCM) is performed in a unified manner. Design-oriented equations are derived for all three types of DC-DC converters. These equations are such that they are expressed explicitly with converter circuit and operating parameters, making them easy to be directly applicable to practical design...
Decades of research have seen single-phase boost-type PWM converters be employed as front-end PFC rectifiers in commercial power supplies. The benefits of employing this technology to comply with power quality standards while assuring high efficiency and low volume and weight have been observed. However, this work shows that further efforts can be driven into new topologies. In this context, a new...
Multilevel Static Compensators (StatComs) offer significant advantages over traditional two level converter based StatComs. The cascaded H-bridge topology for multilevel StatComs is increasing becoming the topology of choice. This paper will address the problem of compensating for the non-ideal nature of the H-bridges so that accurate current control can be achieved with this topology using a predictive...
More "green" power provided by distributed generation will enter into the European electricity network in the near future. In order to control the power flow and to ensure proper and secure operation of this future grid, with an increased level of the renewable power, new power electronic converters for grid connection of renewable sources will be needed. These power converters must be able...
In this paper, a simple FPGA-based current sharing control topology is presented based on one-comparator counter-based control strategy and is applied to a two-phase buck converter. Without any analog-to-digital converter (ADC), good current tracking performances as well as fast transient load responses are easy to realize. Experimental results are provided to verify the effectiveness of the proposed...
This paper discusses a 48-pulse H-bridge PWM inverter which utilizes a quasi-resonant topology that is comprised of a clamping circuit and a resonant circuit, in order to achieve soft switching. The use of a multi-pulse inverter increases the quality of the output whereas the implementation of soft switching technique increases the overall efficiency of the inverter by decreasing switching losses...
Power factor correction (PFC) rectifiers are essential for load side harmonic and reactive power correction. In recent years, research and applications of PFC rectifiers have attracted more attention due to the increased energy awareness in the global. In this paper, a simple digital controlled three-phase six-switch H-bridge boost rectifier is proposed. The control objective is to operate the rectifier...
Two novel circuit topologies dedicating to system within storage battery as standby power supply and operating as bidirectional current source used in hybrid electric vehicle (HEV) are proposed in this paper, and both advantages and disadvantages between the two proposed topologies are investigated. Functions of both discharging process with large current from battery to the relative lower voltage...
In this paper, new multiple dc-dc converter topologies such as boost and buck types are proposed. Basically, multiple converters are interleaved together along with an integrated high frequency multiphase magnetic called zig-zag transformer. The balanced multiphase winding voltages of the transformer are generated by three pulse width modulation (PWM) signals appropriately phase-shifted. The transformer...
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